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Complete checklist

PC FISH Achievements

See all 30 Steam achievements and exact unlock conditions, plus the current player-reported Variant Mastery issue.

Player-reported issue

Variant Mastery may not unlock at 100%

Players report completing 100% of a fish's variants without receiving the matching mastery achievement. This may affect all five Variant Mastery achievements, but it is not an officially confirmed bug as of Aug 31, 2026.

Evidence grade
Player-reported
Official status
Needs evidence
Fix status
No promise

Keep the qualifying fish, capture the 100% screen, restart Steam once, and avoid consuming the fish while reports remain unresolved. Low global completion rates support investigation, but do not prove the cause.

Complete Steam list

All 30 achievements and exact conditions

Verified against Steam · Aug 31, 2026

First steps and aquarium

  • Playtime with the Fish

    Click the aquarium 10 times.

  • Goldfish Guru

    Raise 3 goldfish to adulthood.

  • Aquarium Decorator

    Place a decoration in the aquarium.

  • Aquarium Upgrade I

    Upgrade the aquarium to Level 2.

  • Aquarium Upgrade II

    Upgrade the aquarium to Level 5.

  • Aquarium Upgrade III

    Upgrade the aquarium to Level 10.

Breeding, collecting, merging and trading

  • Fish Breeding I

    Breed fish 5 times.

  • Fish Breeding II

    Breed fish 50 times.

  • Fish Breeding III

    Breed fish 500 times.

  • Fish Collector I

    Collect 10 species of fish.

  • Fish Collector II

    Collect 20 species of fish.

  • Fish Collector III

    Collect 30 species of fish.

  • Fish Merge I

    Merge fish once.

  • Fish Merge II

    Merge fish 10 times.

  • Fish Merge III

    Merge fish 100 times.

  • Fish Trader

    Export fish from the Trade Hub 3 times.

High-star fish

  • ★★★ Rare Fish Collector

    Obtain a ★★★ Rare fish.

  • ★★★★ Rare Fish Collector

    Obtain a ★★★★ Rare fish.

  • ★★★★★ Rare Fish Collector

    Obtain a ★★★★★ Rare fish.

  • ★★★ Legendary Fish Collector

    Obtain a ★★★ Legendary fish.

  • ★★★★ Legendary Fish Collector

    Obtain a ★★★★ Legendary fish.

  • ★★★★★ Legendary Fish Collector

    Obtain a ★★★★★ Legendary fish.

  • ★★★ Mythic Fish Collector

    Obtain a ★★★ Mythic fish.

  • ★★★★ Mythic Fish Collector

    Obtain a ★★★★ Mythic fish.

  • ★★★★★ Mythic Fish Collector

    Obtain a ★★★★★ Mythic fish.

Variant mastery

  • Common Fish Variant Mastery

    Own at least one Common fish with 100% of its variants discovered.

  • Uncommon Fish Variant Mastery

    Own at least one Uncommon fish with 100% of its variants discovered.

  • Rare Fish Variant Mastery

    Own at least one Rare fish with 100% of its variants discovered.

  • Legendary Fish Variant Mastery

    Own at least one Legendary fish with 100% of its variants discovered.

  • Mythic Fish Variant Mastery

    Own at least one Mythic fish with 100% of its variants discovered.

Sources and confidence

Steam global achievements Official update notes Steam community reports

Official conditions and patch notes are separated from player observations. Community reports can change as new versions ship.

PC FISH Breeding CalculatorEstimate community-tested rarity outcomes for PC FISH parent pairings before you commit a breeding slot.PC FISH Breeding ChancesCompare the community rarity table by parent pairing, with its source status, missing sample size, and verification date shown beside the numbers.PC FISH Breeding CombinationsTrack PC FISH parent pairings, rarity outcomes, and unknown breeding combinations without guessing unverified species results.PC FISH Fish DatabaseA launch database structure for PC FISH species, rarity, source, grade, and market notes.